since english is the official language for space and air traffic and more or less internationally understood, we use english and german here.
regarding your question about a midi in/out port. The hardware design for the MEGA65 pcb is finished. We have implemented enough PMOD connectors on the pcb to give the community the possibility to add things like this at a later time and we've implemented breakout ports in the MEGA65 case, to be able to screw addon ports like this to the Case.